package com.example.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.example.reggie.common.BaseContext;
import com.example.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Created with IntelliJ IDEA.
 *
 * @Author: 老肥！！！
 * @Date: 2022/09/07/11:33
 * @Description: 不想学代码了！！！
 */
//这里通过设置过滤器来进行登录的校验和页面数据的保护。
//检查用户是否完成登录
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
//    路径匹配器
    private final static AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
//           获取本次请求的URI
        String requestURI = request.getRequestURI();
//        不需要处理的请求路径
        String[] urls = new String[]{"/employee/login","/employee/logout","/static/**","/templates/**","/user/sendMsg","/user/login"};
        log.info("拦截到请求：{}",request.getRequestURI());//返回部分路径
//      判断请求是否需要处理
        boolean check = check(urls, requestURI);
        if (check){
            log.info("本次请求不需要被处理:{}",request.getRequestURI());
            filterChain.doFilter(request,response);
            return;
        }
        // 4.1       判断登录状态，若登录则直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为： {}",request.getSession().getAttribute("employee"));

            Long empID = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentID(empID);
//            Long id = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);
            filterChain.doFilter(request,response);
            return;
        }
        //    4.2    判断登录状态，若登录则直接放行   移动端用户
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为： {}",request.getSession().getAttribute("user"));

            Long userID = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentID(userID);
//            Long id = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //如果未登录则返回未登录结果,通过输出流方式向客户端页面响应数据,响应数据的内容与前端代码的拦截器内容相同:request.js的47行
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
//    获取请求路径与不需要处理的路径进行比较，返回true则直接放行
    public boolean check(String []urls,String RequestURI){
        for (String url: urls) {
            boolean match = PATH_MATCHER.match(url, RequestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
